Modulating selectivity in CO2 Methanation through Rhodium catalysts supported on Zirconia-Chemically grafted SBA-15

被引：6

作者：

Gomez-Flores, K. A. ^{[1
]}

Solis-Garcia, A. ^{[2
]}

Lam, S. A. Jimenez ^{[1
]}

Cervantes-Gaxiola, M. E. ^{[1
]}

Castillo-Lopez, R. I. ^{[1
]}

Leyva, J. P. Ruelas ^{[1
]}

Gomez, S. A. ^{[3
]}

Flores-Aquino, E. ^{[2
]}

Zepeda, T. A. ^{[2
]}

机构：

[1] Univ Autonoma Sinaloa, Fac Ciencias Quim Biol, Josefa Ortiz Dominguez, Ciudad Univ 80013, Sinaloa, Mexico

[2] Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana,Ensenada km 107, Ensenada 22800, BC, Mexico

[3] UAM Iztapalapa, Dept Ingn Proc Hidraul, Ave San Rafael Atlixco 186, Ciudad Mexico 09340, Mexico

来源：

MOLECULAR CATALYSIS | 2024年 / 558卷

关键词：

CO; 2; utilization; methanation; selectivity; Rh-based catalyst; In-situ FTIR; SBA-15; CARBON-DIOXIDE METHANATION; MESOPOROUS SILICA; HYDROGENATION; TEMPERATURE; ADSORPTION; STABILITY; REDUCTION; MECHANISM; TRANSIENT; NI/ZRO2;

D O I：

10.1016/j.mcat.2024.114035

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study presents the impact of ZrO2 2 incorporation on Rh-supported SBA-15 catalysts for CO2 2 hydrogenation. ZrO2 2 was chemically grafted onto the SBA-15 surface, varying concentrations of ZrO2 2 from 5 to 20 wt.%. The ZrO2-free 2-free catalyst favored CO production, leaning towards the reverse water gas shift reaction. The addition of ZrO2 2 notably enhanced catalytic activity and led to a significant shift in selectivity towards methane production. The selectivity modulation is linked with the modified surface of SBA-15, covered with a ZrO2 2 phase. The FTIR characterization under reaction conditions evidenced Rh-carbonyls formation in all samples. However, in catalysts materials with ZrO2, 2 , formate species are also formed, probably promoted by the Zr-OH groups. A linear relation between formate species and the CH4 4 selectivity suggests that the methane formation could be associated with the hydrogenation of formate species, while the desorption of carbonyls on Rh can explain the CO generation.

引用

页数：12

共 75 条

[31] Tuning Selectivity of CO2 Hydrogenation Reactions at the Metal/Oxide Interface [J].