Ni-based nanocomposite catalysts for energy-saving syngas and hydrogen production from CH4/CO2 and CH4/CO2/H2O

FUEL 21

Bo-Qing Xu, bqxu@mail.tsinghua.edu.cn, Wen-Tao Zheng, and Hong-Mei Liu. Department of Chemistry, Tsinghua University, Beijing, 100084, China
This presentation describes our recent investigation on energy saving catalysts for natural gas conversion. Nanostructured Ni-oxide (oxide = ZrO2, MgO and Al2O3) catalysts are prepared as nanocomposites consisting of comparably sized metallic Ni nanocrystals and nanopaticles of “support” oxides. Compared with the conventional oxide-supported Ni catalysts, featuring metallic Ni nanocrystals on oxide support particles of one to several orders of magnitude larger, the nanocomposite catalysts are found extremely stable in catalyzing the methane reforming reactions using stoichiometric CO2 and methane as well as steam (H2O) and methane. The nanocomposite catalysts show also stable catalysis for a combined steam and CO2 reforming of methane under stoichiometric feed compositions, enabling modulation of product syngas molar ratios (H2/CO = 1.0~3.0) by varying the feed H2O/CO2 ratio. Further tests of nanocomposite Ni-ZrO2 and Ni-MgO catalysts for hydrogen generation by stepwised methane reforming processes, involving a catalytic methane decomposition to produce pure hydrogen and carbon deposits as the first step (step-I) and a volatilization of the carbon deposits by steam or CO2 as the second step (step-II) demonstrate that the nanocomposite catalysts are optimistic for energy-saving in methane reforming technologies.
 

Advances in CO2 Conversion and Utilization
8:00 AM-12:10 PM, Sunday, August 16, 2009 Marriott Metro Center -- Salon A/B, Oral

Sci-Mix
8:00 PM-10:00 PM, Monday, August 17, 2009 Walter E. Washington Convention Center -- Hall D, Sci-Mix

Division of Fuel Chemistry

The 238th ACS National Meeting, Washington, DC, August 16-20, 2009