In this report, the promoting aspect of Pd on the activity of spinel CuCr2O4 and Pd catalytic systems in CO oxidation is investigated. Catalysts with compositions of 10 % spinel CuCr2O4 synthesized via modified sol–gel in situ on γ–Al2O3 support and Pd nanoparticles ( ÷ ) % then decorated on CuCr2O4/γ–Al2O3 via impregnation method by decomposed palladium (II) acetate solution at 280 °C for 2 h. Promoting aspect of Pd nanoparticles evaluating by Temperature Program Surface Reaction. | Journal of Science and Technology 55 (1B) (2017) 70–76 PROMOTING ASPECT OF PALLADIUM NANOPARTICLES ON SPINEL Pd@CuCr2O4/γ–Al2O3 CATALYTIC SYSTEM IN CARBON MONOXIDE OXIDATION Pham Trung Kien1, Le Ngoc Long1, Do Quang Minh1, Nguyen Quoc Thiet2, Le Van Lu3, Tran Van Khai3, * 1 Department of Ceramic Materials, Faculty of Materials Technology, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam 2 Catalyst Department – Institute of Applied Materials Science – VAST 1 Mac Dinh Chi, Ben Nghe Ward, District 1, Ho Chi Minh City – Vietnam 3 Department of Metallic Materials, Faculty of Materials Technology, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam * Email: tvkhai1509@ Received: 30 December 2016; Accepted for publication: 3 March 2017 ABSTRACT In this report, the promoting aspect of Pd on the activity of spinel CuCr2O4 and Pd catalytic systems in CO oxidation is investigated. Catalysts with compositions of 10 % spinel CuCr2O4 synthesized via modified sol–gel in situ on γ–Al2O3 support and Pd nanoparticles ( ÷ ) % then decorated on CuCr2O4/γ–Al2O3 via impregnation method by decomposed palladium (II) acetate solution at 280 °C for 2 h. Promoting aspect of Pd nanoparticles evaluating by Temperature Program Surface Reaction (TPSR) method in temperature range of 30 ÷ 450 °C and 15 –1 flow gases consist of 1 % CO, 20 % O2 and 79 % N2 on g catalysts. The experimental results reveal that the as–prepared materials completely convert CO at temperatures below 140 °C with % Pd compare to 300 °C without Pd in the component. CO conversion highly increases with increasing amounts of Pd, with gas hourly space velocity reached by 1500 ––1 that exhibits promising application of these catalytic systems in exhausts treatment containing CO at low temperatures. Keywords: spinel CuCr2O4, palladium catalyst, sol–gel PVA, CO oxidation. 1. INTRODUCTION Spinel CuCr2O4 has attracted
