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Xin Fang,Yuhan Men,Fan Wu,Qinghu Zhao,Ranjeet Singh,Penny Xiao,Liying Liu,Tao Du,Paul A. Webley 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
CO2 hydrogenation to methanol is attracting specific interest because of its potential economic and environmental benefits in transforming waste CO2 to value-added hydrocarbons. Copper-based catalysts are documented as efficient and widely applied, whereas insufficient catalytic properties of conventional catalysts hinder their application. Herein, catalysts using Mg-Al hydrotalcite (HT) as the carrier of Cu/ZnO/ZrO2 (CZZ) nanoparticles were prepared to exploit special advantages of hydrotalcite on copper dispersion and catalytic performance. The results show that CZZ nanoparticles can be uniformly dispersed on external surfaces of HT, elevating BET surface areas of CZZ-HT samples by at least 2.5 times compared to pure CZZ. The HT carrier also enriches strong basic sites and hence elevates CO2 adsorption capabilities in the range of reaction temperature. Both copper surface area and copper dispersion of CZZ-HT samples are improved dramatically. A catalyst containing 45.1 wt% of CZZ shows 1.1 times higher copper surface area per gram CZZ and 1.6 times higher copper dispersion than the reference CZZ. Subsequent reactions demonstrate the CZZ-HT samples show remarkably promoted turnover frequency (TOF) for methanol synthesis and retain considerable catalyst stability. The typical catalyst prepared in this research, at the reaction temperature of 523 K and pressure of 3.0MPa, presents a 68.2% higher methanol STYCu per gram copper and an 117.0% higher SMeOH/SCO ratio than the commercial catalyst. The support HT plays a crucial role for the enhanced catalytic performance physically and chemically. Thus, the as-prepared CZZ-HT catalyst provides a significant improvement for CO2 utilization.
Huamei Duan,Yunxia Yang3,Jim Patel,Nick Burke,Yuchun Zhai,Paul A. Webley,Dengfu Chen,Mujun Long 한국탄소학회 2018 Carbon Letters Vol.25 No.-
Activated carbon (AC) was modified by ammonium persulphate or nitric acid, respectively. AC and the modified materials were used as catalyst supports. The oxygen groups were introduced in the supports during the modifications. All the supports were characterized by N2-physisorption, Raman, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and thermogravimetric analysis. Methanol synthesis catalysts were prepared through wet impregnation of copper nitrate and zinc nitrate on the supports followed by thermal decomposition. These catalysts were measured by the means of N2-physisorption, X-ray diffraction, XPS, temperature programmed reduction and TEM tests. The catalytic performances of the prepared catalysts were compared with a commercial catalyst (CZA) in this work. The results showed that the methanol production rate of AC-CZ (23 mmol-CH3OH/(g-Cu·h)) was higher, on Cu loading basis, than that of CZA (9 mmol-CH3OH/(g-Cu·h)). We also found that the modification methods produced strong metal-support interactions leading to poor catalytic performance. AC without any modification can prompt the catalytic performance of the resulted catalyst.
NaX 제올라이트가 담지된 허니컴 흡착제의 제조 및 이의 이산화탄소 흡착특성
Yoo, Yoon-Jong,Kim, Hong-Soo,Singh, Ranjeet,Xiao, Penny,Webley, Paul A.,Chaffee, Alan L. 한국공업화학회 2009 공업화학 Vol.20 No.6
The honeycomb adsorbent was prepared for adsorbing and seadsorbent was prepared by using zeolite sheet, which contained zeolite as component. The steady-state adsorption properties and surface morphologies were analyzed and breakthrough characteristics were ananlyzed by providing 16% carbon dioxide mixed gas. By thermal regeneration, carbon dioxide concentration properties were analyzed, and the adsorptive separation process was compared between thermal swing adsorption and pressure swing adsorption after adsorbent temperature change during heating. The breakthrough results of the honeycomb showed possibility parating carbon dioxide from combustion exhaust gas, which had deep impact on climate change, and the characteristics of the adsorbent were studied. Na-X zeolite was coated on a honeycomb prepared with ceramic sheet or active carbon sheet so that the two honycomb can be used at high temperature. Third honeycomb of rotary adsorptive concentration process. 지구온난화에 가장 큰 영향을 미치는 이산화탄소를 연소 후 배가스로부터 흡착 분리하기 위한 허니컴 흡착소자의 제조 및 그 특성에 관한 것이다. 고온사용이 가능하도록 세라믹쉬트, 활성탄소 쉬트를 사용하여 허니컴을 제조하였고 그 위에 Na-X 제올라이트를 코팅하였다. 또한 Na-X 제올라이트를 포함시킨 제올라이트 쉬트를 사용하여 허니컴 흡착제를 제조하였다. 이들 세 가지 허니컴 흡착제에 대하여 이산화탄소 흡착량, 표면특성 그리고 16% 이산화탄소 혼합가스를 공급하여 파과특성을 분석하였다. 또한 가열재생에 따른 이산화탄소 농축특성과 가열시 허니컴 흡착제의 온도변화를 분석하여 열스윙 흡착 분리공정에서의 우월성을 비교 분석하였다. 이들 허니컴을 사용한 흡착파과실험 결과를 바탕으로 하여 회전식 흡착 농축공정의 적용 가능예를 보여주었다.