B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/755 (2006.01) B01J 23/745 (2006.01) B01J 32/00 (2006.01) B01J 37/02 (2006.01) B01J 37/08 (2006.01) C01B 3/04 (2006.01) C01B 31/08 (2006.01)
Patent
CA 2676333
The present invention provides catalysts, and methods of making the catalysts using peat as a raw material for highly stable activated carbon- based catalysts based on the transition metals and noble metals. Particular embodiments include two new carbon-based Ni/Fe catalysts useful for catalytic decomposition of ammonia into N2 and H2. These catalysts are prepared using a porous activated carbon (AC) support derived from peat by H3PO4 activation. The newly developed catalysts proved to be highly active for ammonia decomposition. The conversion of 2000 ppm NH3 diluted in helium over the Fe catalyst reached as high as 90% at 750°C and at a space velocity of 45000 h-1, compared with only about 15% with the activated carbon alone without metal loading. The new catalyst of Fe/AC was also much more active than a previously reported Fe catalyst supported on a commercial activated carbon. In addition, the new Fe/Ni catalysts showed superior performance with respect to their resistance to catalyst deactivation. Both catalysts remained active as the reaction time increased up to 10 hours without showing signs of deactivation. Fresh and spent catalysts were characterized by XRD, XPS and TPD. Possible catalytic mechanisms are discussed, and a cycle mechanism, involving both metal phosphides and metal nitrides, is proposed for the NH3 decomposition reactions over the new Fe/Ni catalysts.
Donald Jalcyn
Ohtsuka Yasuo
Xu Chunbao
Donald Jalcyn
Hill & Schumacher
Ohtsuka Yasuo
Xu Chunbao
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