Thermally stable Ni-Mo methanation catalysts

129 Thermally Stable Ni-Mo Methanation Catalysts K. Suzuki et al (National Chemical Laboratory for Industry, Japan) have reported (J.Japan. Petrol. Inst., 25 (1982) 323) results for zirconia supported nickel-molybdenum alloy catalysts for use in methanation at high temperatures. A catalyst containing 20% NiO, 25% Moo3 and 55% ZrO was succesfully tested at 6500C a$d at a pressure of 80 kg cm-2 with a feed mixture containing 15% CO, 45% H and 40% CH (GHSV = 15,00Oh-17 for several weeks. Various supports were tested (moniclinic zirconia, zirconyl hydroxide, zirconyl carbonate and a cubic zirconia stabilised with 8% Y20 ) and it was ased on monofound that a catalyst l! clinic zirconia was most active, the crystal form of the zirconia not changing during the test. It is suggested that this observation is due to a lower interaction between the nickel and molybdenum and this largely covalent support compared with that with the other supports. Life of a WOq-TiOP Catalyst for the Reduction of NO, with NH3 Of the many processes which have been considered for the removal of NO, from stationary sources. one based^on the reduction of NO, with NH? on catalvsts such as VQOk-TiOq or"W03-TiO has been consiae&d tg be the mosz promising. These catalysts are known to have excellent activity and to be stable in SO,; the W03-TiO is thermally stable at 4000C and aiove and has a low activity for the oxidation of Sop. The results of a 5000 h life-test on a 10% W03-Ti02 catalyst have recently been reported by S. Morikawa et al of Ishikawajima Harima Heavy Industries, Japan (See Bull. Chem. Sot. Japan, 55 (1982) 2254). This test was carried out in a pilot plant (15 cm internal diameter reactor with 7 mm diameter pellets) in a real flue-gas containing vanadium (220-230 ppm) and SO, (5.2% S) as well as NO, (95-105 ppm). Steady activites of >90% NO reduction were achieved for 5060 h at 4000C with a space velocity of 2700 h-I. It was found that catalyst samples *erhlJds

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5 No. 1 -January

1983

removed from the reactor at intervals and tested in a laboratory reactor had higher activities than the fresh catalyst at temperatures of 250-3500C. The activity for SO2 oxidation also increased with time. This oradual increase of activity for both reactions was thought to be due to the vanadium component in the flue-gas. Zeolites-Scienceand Technology A NATO Advanced Study Institute with this title will be held at the Hotel Sintra-Estoril,near Lisbon, Portugal, from 1-12 May 1983. The course will cover such topics as synthesis , structure, characterisation,sorption mechanisms, catalysis and industrial applications in the areas of catalytic reactors, ion exchange and adsorption. Lecturers at the course will be: R. Barrer, D. Barthomeuf, E. Oerouane, M. Guisnet, C. Kenney, P. Jacob, P. Jacobs, H. de Lasa, H. Lechert, C. Naccache, J. Rabo, F. Ribeiro, A. Rodrigues, D. Rollman and T. Sherman. Further information can be obtained from Dr. F. Ramoa Ribeiro, Chemical Engineering Department, Instituto Superior Tgchnico, 1096 Lisboa Codex, Portugal. Catalyst Market Survey Chemical Hitech Inc, of P.O. Box 119, 1211 Geneva 6, Swizerland, have recently

issued a very complete study entitled "Market and Technical Survey of the InternationalCatalysts and Catalytic Process Industry (USA, Europe, Japan, Others) 1980-1985". The survey, in the form of a 500-page report costing $ 6.000, contains information on the following subjects: (a) a general overview of the market for catalysts in the United States, Europe, Japan and other countries; (b) the market for catalvsts for petroleum refining (catalytic cracking, alkylation, reforming, hydroprocessing,hydrocracking, polymerisation, hydrogen production, etc.); (cl . , the market for catalysts for the chemical process-industries (HDPE, HN03, ethylene oxide, H2S04, formaldehyde, hydrogenation, organic syntheses, NH3, CH OH,,styrene, and many others3 ;