High CO adsorption capacity, and CO selectivity to CO₂, N₂, H₂, and CH₄ of CuCl/bayerite adsorbent

Cho, Kanghee,Kim, Jungsu,Park, Jong-ho,Jung, Taesung,Beum, Hee Tae,Cho, Dong-woo,Rhee, Young Woo,Han, Sang Sup Elsevier 2019 Microporous and mesoporous materials Vol.277 No.-

<P><B>Abstract</B></P> <P>We synthesized nanoporous CO-selective adsorbent composed of CuCl supported on bayerite. Before supporting the CuCl, the bayerite chemical was calcined at 623 K to increase the surface area to 469 m<SUP>2</SUP> g<SUP>−1</SUP>. The CuCl was highly dispersed on the activated bayerite via a thermal monolayer dispersion process. The highest CO adsorption capacity was achieved at an optimal temperature of 573 K and CuCl content of 30 wt%. Thus synthesized adsorbent exhibited a high CO adsorption capacity of 48.5 cm<SUP>3</SUP> g<SUP>−1</SUP> at 293 K, but a very low CO<SUB>2</SUB> adsorption capacity (2.89 cm<SUP>3</SUP> g<SUP>−1</SUP>), resulting in CO/CO<SUB>2</SUB> separation factor of 16.8. When the CuCl content increased to 36 wt%, the adsorbent exhibited much higher separation factor (35.5), although the CO adsorption capacity was somewhat smaller (41.6 cm<SUP>3</SUP> g<SUP>−1</SUP>). The CO adsorption capacity and CO/CO<SUB>2</SUB> selectivity of this adsorbent are larger than those of our previous CuCl/boehmite adsorbent showing CO adsorption of 34 cm<SUP>3</SUP> g<SUP>−1</SUP> and a CO/CO<SUB>2</SUB> separation factor of 12.4. The present adsorbent also shows very high selectivity for CO over H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>. Therefore, this adsorbent is expected to show excellent CO separation performance for various industrial processes such as steam-reforming and steel-making which involve CO, CO<SUB>2</SUB>, H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly selective CO adsorbent based on CuCl/bayerite composite was synthesized. </LI> <LI> Adsorbent exhibited very high CO/CO<SUB>2</SUB> selectivity. </LI> <LI> High separation ability is attributed to the large surface area of bayerite. </LI> <LI> Thermal treatment conditions for dispersion of CuCl on bayerite were optimized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

CuCl2가 담지된 V2O5-WO3/TiO2 SCR 촉매에 의한 수은 및 NOx 동시 제거에서 SO2의 영향

함성원 한국청정기술학회 2022 청정기술 Vol.28 No.1

CuCl2-loaded V2O5-WO3/TiO2 catalyst showed excellent activity in the catalytic oxidation of elemental mercury tooxidized mercury even under SCR condition in the presence of NH3, which is well known to significantly inhibit the oxidationactivity of elemental mercury by HCl. Moreover, it was confirmed that, when SO2 was present in the reaction gas together withHCl, excellent elemental mercury oxidation activity was maintained even though CuCl2 supported on the catalyst surface wasconverted to CuSO4. This is thought to be because not only HCl but also the SO4 component generated on the catalyst surfacepromotes the oxidation of elemental mercury. However, in the presence of SO2, the total mercury balance before and after thecatalytic reaction was not matched, especially as the concentration of SO2 increased. In order to understand the cause of this,further studies are needed to investigate the effect of SO2 in the SnCl2 aqueous solution employed for mercury species analysisand the effect of sulfate ions generated on elemental mercury oxidation. It was confirmed that SO2 also promotes NOx removalactivity, which is thought to be because the increase in acid sites by SO4 generated on the catalyst surface by SO2 facilitates NH3adsorption. The composition change and structure of the components present on the catalyst surface under various reactionconditions were measured by XRD and XRF. These measurement results were presented as a rational explanation for the resultsthat SO2 enhances the oxidation activity of elemental mercury and the NOx removal activity in this catalyst system. HCl에 의한 원소수은 산화활성을 크게 억제하는 것으로 잘 알려진 NH3가 존재하는 SCR조건에서도 CuCl2가 담지된V2O5-WO3/TiO2 촉매는 원소수은의 산화에 우수한 활성을 나타내었다. 더구나, HCl과 함께 SO2가 반응가스에 존재할 경우에촉매표면에 담지된 CuCl2가 CuSO4로 변환되는데도 불구하고 뛰어난 원소수은 산화활성이 유지되는 것이 확인되었다. 이는HCl 뿐만 아니라 촉매 표면에 생성된 SO4 성분이 원소수은의 산화를 촉진시키기 때문으로 판단된다. 그러나 SO2 존재 하에서는 촉매반응 전후의 전체 수은 수지가 맞지 않는 현상이 나타나는데 특히 SO2 농도가 높을수록 심하게 나타났다. 이의 원인 파악을 위해서는 수은 종 분석 방법으로 적용된 SnCl2 수용액에서 SO2의 영향과 촉매표면에 생성되는 황산이온이 원소수은 산화에 미치는 영향에 대한 추가적인 연구가 필요하다. SO2는 NOx 제거 활성도 촉진시키는 것으로 확인되는데 이는 SO2에 의해촉매 표면에 생성된 SO4에 의한 산점 증가가 NH3 흡착을 용이하게 하기 때문으로 판단된다. 다양한 반응조건에서 촉매 성분의 조성과 구조 변화는 XRD와 XRF로 측정하였으며 이들 측정 결과는 SO2가 본 촉매시스템에서 원소수은의 산화 활성과NOx 제거 활성을 증진시키는 현상을 합리적으로 설명하는 근거로 제시되었다.

Catalytic performance of CuCl2-modified V2O5-WO3/TiO2 catalyst for Hg0 oxidation in simulated flue gas

Chuanmin Chen,Wenbo Jia,Songtao Liu,Yue Cao,Bing Zhao,Jianqiao Wang 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3

CuCl2-SCR catalysts prepared by an improved impregnation method were studied to evaluate the catalytic performance for gaseous elemental mercury (Hg0) oxidation in simulated flue gas. Hg0 oxidation activity of commercial SCR catalyst was significantly improved by the introduction of CuCl2. Nitrogen adsorption, XRD, XRF and XPS were used to characterize the catalysts. The results indicated that CuCl2 was well loaded and highly dispersed on the catalyst surface, and that CuCl2 played an important role for Hg0 catalytic oxidation. The effects of individual flue gas components on Hg0 oxidation were also investigated over CuCl2-SCR catalyst at 350 oC. The co-presence of NO and NH3 remarkably inhibited Hg0 oxidation, while this inhibiting effect was gradually scavenged with the decrease of GHSV. Further study revealed the possibility of simultaneous removal of Hg0 and NO over CuCl2-SCR catalyst in simulated flue gas. The mechanism of Hg0 oxidation was also investigated.

Highly sensitive fluorescent sensor targeting CuCl₂ based on thiophene attached anthracene compound (TA)

Nguyen, T.V.T.,Seo, Y.J. Pergamon Press ; Elsevier Science Ltd 2017 Tetrahedron letters: the international organ for t Vol.58 No.10

A novel thiophene attached anthracene (TA) based fluorescent compound was designed and synthesized. The TA showed a high quantum yield (Qy=0.34) in regard to fluorescence. We applied this TA compound to detect specific metal compound and found that it could identify CuCl<SUB>2</SUB> from other metals through dramatic fluorescence change at λ<SUB>max</SUB>=460nm. It showed strong quenching fluorescence property with CuCl<SUB>2</SUB> while with other metal compounds it exhibited strong blue fluorescence emission. UV/Vis absorption spectroscopy clearly demonstrated that the quenching property of TA at λ<SUB>max</SUB>=460nm was due to overlapping of the fluorescence peak of TA at λ<SUB>max</SUB>=460nm and the absorption band of CuCl<SUB>2</SUB> (from 190nm to 525nm). Binding constant (K'), which was 0.0895mM<SUP>-2</SUP>, indicated a complexation ratio between TA and CuCl<SUB>2</SUB> as 1:2 and this interaction induced quenching property.

Comprehensive analysis of acid gases on mercury removal by CuCl2 modified char exposure to oxy-fuel environment: Experiment and XPS perception

Zeng Qingshan,Wang Hui,Wu Jingmao,Ran Hengyuan,Yang Kang,Wu Jianfei 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12

In this work, 0.15 mol/L CuCl2 solution was used to impregnate rice husk char. Experiments were conducted in a laboratory-scale fixed-bed reactor to investigate the oxidation mechanism of Hg0 by acidic gases. The effects of acid gases (SO2, HCl and NO) atmospheres on the mercury removal efficiency of the adsorbent were studied by FTIR, XPS and experiments. The FTIR results showed that the surface of the prepared rice husk char adsorbent contained a large amount of Cu2+ and chlorine-containing functional groups. The XPS results showed that the Cu+ on the surface of the adsorbent increased after mercury adsorption. This work shows that the inhibitory effect of SO2 on Hg removal is reflected in the blockage of the pore structure on the adsorbent surface; the competitive adsorption of O2 needed for the generation of C-O*, the formation of an acid mist by SO2 hinders the contact of Hg0 with the active site. The promotion of HCl is due to the production of active chlorine substances (Cl*) to promote the oxidation of Hg0 to HgCl, HgCl2 and HgO. And introduction of NO will react with O2, while generation of NO2 is beneficial to the oxidation of Hg0 to HgO and Hg(NO3)2. The optimum mercury removal efficiency of the adsorbent is nearly 100% under certain conditions.

Enhanced Photovoltaic Performance of Perovskite Solar Cells by Copper Chloride (CuCl2) as an Additive in Single Solvent Perovskite Precursor

Md. Emrul Kayesh,Kiyoto Matsuishi,Towhid H. Chowdhury,Ryuji Kaneko,Takeshi Noda,Ashraful Islam 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6

In this letter, we have introduced copper chloride (CuCl 2 ) as an additive in the CH 3 NH 3 PbI 3 precursor solution to improvethe surface morphology and crystallinity of CH 3 NH 3 PbI 3 fi lms in a single solvent system. Our optimized perovskite solarcells (PSCs) with 2.5 mol% CuCl 2 additive showed best power conversion effi ciency (PCE) of 15.22%. The PCE of the PSCsfabricated by CuCl 2 (2.5 mol%) additive engineering was 56% higher than the PSC fabricated with pristine CH 3 NH 3 PbI 3 .

염산용액에서 Alamine336에 의한 염화 제1, 2구리의 용매추출

이만승 ( Man Seung Lee ),이진영 ( Jin Young Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.5

Solvent extraction experiments of cupric and cuprous chloride with Alamine336 have been performed from HCl solution. In order to identify the solvent extraction reaction, distribution diagram of cupric and cuprous species with HCl concentration was obtained by considering complex formation reaction and the activity coefficient of solutes with Pitzer equation. Analysis of the solvent extraction data by graphical method together with the distribution diagram of copper indicated that solvent extraction reaction of copper with Alamine336 depends on HCl concentration. In strong HCl solution of 3 and 5 M, CuCl4(2-) and CuCl3(2-) took part in the solvent extraction reaction as Cu(II) and Cu(I), respectively. When HCl concentration was 1 M, CuCl(2-) was extracted into the organic phase in the case of Cu(I) while adduct formation between Cu2+ and Alamine336 was responsible for the solvent extraction reaction of Cu(II). (Received February 3, 2009)

Articles : Low Temperature Oxidation of CO over Supported PdCl2-CuCl2 Catalysts

( Dong Jun Koh ),( Jae Hwal Song ),( Sung Won Ham ),( In Sik Nam ),( Rae Woong Chang ),( Eun Duck Park ),( Jae Sung Lee ),( Young Gul Kim ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6

PdCl₂-CuCl₂catalyst supported on activated carbon was examined for the low temperature oxidation of CO. The catalyst developed in the present study was active and stable at ambient conditions if water were existing in the feed gas stream. The addition of Cu(NO₃)₂into the PdCl₂-CuCl₂catalyst significantly enhanced the CO oxidation activity. X-ray diffraction study revealed that the role of Cu(NO₃)₂was to stabilize active Cu(Ⅱ) species, Cu₂Cl(OH)₃, on the catalyst surface which maintains the redox property of palladium. When HCl and SO₂were also existing in the feed, they easily inactivated the catalyst. It was found that HCl and SO₂inhibited the formation of active Cu(Ⅱ) species on the catalyst surface.

무당개구리(Bombina orientalis) 배아를 이용한 copper chloride의 발생독성, 중배엽 형성 장애 및 초기 발생과정에서의 세포 사멸 양상 분석

안효민,박찬진,계명찬 한국발생생물학회 2013 한국발생생물학회 학술발표대회 Vol.2013 No.8

Copper Chloride (CuCl2)는 수계생물에 매우 강한 독소로 작용한다. 이에 한국 토착 양서류인 무당개구리(Bombina orientalis)의 배아를 이용하여 CuCl2의 독성에 대하여 알아보고자 하였다. 배아 발생 독성 실험, Trypan blue 염색, 동물극 분리체의 예정 중배엽 유도, MTT 분석, real-time PCR을 수행하였다. 결과로, 생존율에 근거한 반수치사농도는 6.50 μM, 기형율에 근거한 반수기형농도는 2.13 μM로 확인되었다. 주요 기형패턴으로는 head malformation, bent tail이 관찰되었고, 3 μM 이상의 농도에서 두부와 미부의 유의적인 성장 저해가 관찰되었다. 10 μM 이상의 농도에서 배아 전체의 세포사멸이 이루어짐을 확인하였다. 동물극 분리체의 길이신장과 길이/폭 비율이 1 μM 이상의 처리군에서 유의적인 감소를 보였다. MTT 분석 결과, 10 μM 이상의 농도에서 유의적인 감소를 보였다. 중배엽 관련 유전자 중 goosecoid, noggin, chordin, follistatin가 1 μM 이상의 처리군에서 유의적인 감소를, epidermal keratin가 10 μM 이상의 농도에서 유의적인 증가를 보였다. Apoptosis 관련 유전자 중 BAK와 BAX는 각각 10 μM 이상의 농도에서 유의적인 감소와 증가를 보였다. 이 연구를 통하여, CuCl2가 무당개구리 배아의 중배엽 관련 유전자의 발현을 저해함으로서, 발생 과정의 장애를 유발하는 것으로 사료된다.

Facile Synthesis of 3-Thioxo-3H-benzo[f]chromen-2-yl methanone and 3H-Benzo[f]chromene-3-one Under Solvent Free Condition

Singh, Okram Mukherjee,Devi, Nepram Sushuma,Devi, Laishram Ronibala,Lim, Ki-Bum,Yoon, Yong-Jin,Lee, Sang-Geyong Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.1

A facile, convenient, efficient and high yielding synthesis of a combinatorial library of coumarins has been developed by the condensation of readily available $\beta$-oxodithioesters and S,S-acetal with 2-hydroxy-1-naphthaldehyde in the presence of catalytic amount of $CuCl_2$ under solvent free conditions.