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PROPOSAL OF COOPERATIVE STUDY TOWARD ESTABLISHING ASIACATALYST
Niwa, Miki 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Cooperative studies on $quot;Reference Catalyst$quot; in Japan have proven to be very important and useful not only for characterization of catalysts but also for standardization of characterization techniques. This recognition has motivated us to propose $quot;Asiacatalyst$quot;, an extended version of Reference Catalyst, for similar cooperative activities in Asian countries.
Review : Proposal of Cooperative Study Toward Establishing Asiacatalyst
( Miki Niwa ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Cooperative studies on $quot;Reference Catalyst$quot; in Japan have proven to be very important and useful not only for characterization of catalysts but also for standardization of characterization techniques. This recognition has motivated us to propose $quot;Asiacatalyst$quot;, an extended version of Reference Catalyst, for similar cooperative activities in Asian countries.
김종호,Niwa, Miki 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-
Aluminum-containing MCM-41 mesoporous materials were synthesized at the conditions of 10 and 9 of the gel pH by utilizing a method of adjusting the equilibrium in the gel using acetic acid. The structure of MCM-41 was characterized by XRD, N₂adsorption and TME; the hexagonal array structure of meso pores was identified. The solid acidity was characterized by IR of adsorbed pyridine, TPD of ammonia and test reactions such as the isomerization of 1-butene and the cracking of cumene. The catalytic activities of AI-MCM-41 with a SiO₂/AI₂O₃ratio of 17 were similar to those of typical silica-alumina catalyst.
김종호,서곤,Miki, Niwa 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-
The modification of HY zeolite (SiO₂/Al₂O₃=5.6 or 40.4) was carried out by a method of chemical vapor deposition of silicon alkoxide, e.g., Si(OCH₃)₄or Si(OCH₃)₂(CH₃)₂. The parent and silica-deposited HY zeolites were characterized by N₂or 1,3,5-triisopropylbenzene adsorption measurement. The control of pore-opening size is affected by the Al concentration of HY zeolite. The pore-opening of HY zeolite (SiO₂/Al₂O₃=5.6) was completely closed by the deposition of large amount of silica. On the other hand, the pore-opening size of HY zeolite (SiO₂/Al₂O₃=40.4) can be narrowed by the deposition of silica. We thus obtained the HY (SiO₂/Al₂O₃=40.4) zeolites with the different pore-opening sizes.
Catalytic Properties of Aluminium - containing MCM -41
Kim, Jong Ho,Tanabe, Masahisa,Miki Niwa 한국공업화학회 1997 Journal of Industrial and Engineering Chemistry Vol.3 No.1
The mesoporous material AIMCM-41 with a low silica to alumina ratio of 17 was synthesized by utilizing a method of adjusting the equilibrium in the gel using acetic acid. The catalytic activity of AIMCM-41 was tested in the isomerization of 1-butene, the cracking of cumene and the alkylation of 2-isopropylnaphthalene with isopropyl alcohol. AIMCM-41 exhibited the solid acidity enough to catalyze various reactions. In particularly, the long catalytic life of AIMCM-41 for the isopropylation of 2-isopropylnaphthalene comparing to a silica-alumina catalyst and HY zeolite was noteworthy.
Katada, Naonobu,Nouno, Kazuma,Lee, Jun Kyu,Shin, Jiho,Hong, Suk Bong,Niwa, Miki American Chemical Society 2011 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.115 No.45
<P>Acidic properties of cage-based, small-pore aluminosilicate zeolites with CHA, AFX, RHO, LEV, ERI, and LTA topologies and their silicoaluminophosphate (SAPO) analogues were measured by means of an ammonia IRMS (infrared/mass spectroscopy)-TPD (temperature-programmed desorption) method. All SAPO molecular sieves studied here showed weaker Brønsted acid strength (11–26 kJ mol<SUP>–1</SUP> lower in the heat of ammonia desorption) than their aluminosilicate counterparts. The density functional theory (DFT) calculations of the ammonia desorption energy were in good agreement with experiments; the difference in the energy of ammonia desorption was less than 10 kJ mol<SUP>–1</SUP>. DFT also showed that the introduction of Al into the SiO<SUB>2</SUB> framework to form aluminosilicate zeolites resulted in large changes to the distance between atoms close to the acid site, while Si substitution into the AlPO<SUB>4</SUB> framework to form SAPO materials predominantly modified the angles between atoms relatively far from the acid site. The introduction of Al into SiO<SUB>2</SUB> frameworks causes higher compression of the Al–OH–Si bridge, inducing strongly acidic behavior, while the more flexible Al–O–P bond relaxed the compression in SAPO frameworks.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-45/jp207894n/production/images/medium/jp-2011-07894n_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp207894n'>ACS Electronic Supporting Info</A></P>