Hydrogen Production from Catalytic Gasification of Çan Lignite

Abstract

In this study, Çan lignite, a Turkish lignite with a high Sulphur (5.61 %) and ash (23.09%) content, were gasified with Na2CO3, NiCl2, Fe2O3, K2CO3 and Ca(NO3)2 catalysts and effects of these catalysts on gasification, in terms of total gas amount, and composition of produced gas was evaluated, and the most effective catalyst was determined. Gasification experiments were performed at atmospheric pressure with 0.5 mL min-1 water feed flow rate. The most effective catalyst was determined as Na2CO3 at 700 ºC. The total gas volume produced by gasification of 1.0 g of coal (dry-ash free) with %3 Na catalyst at 700 ºC was 2839 mL with % 74.7 H2. Finally, different gasification temperatures between 600-900 ºC were tested with the optimum amount of catalyst and effects of temperature on gasification were evaluated. The highest gasification yield in terms of total gas volume and the produced amount of H2 was obtained at 900 ºC with 3033 mL total gas volume and 75.7 % H2.

Keywords

• hydrogen,catalytic gasification,coal

Çan Linyitinin Katalitik Gazlaştırılması ile Hidrojen Eldesi

Abstract

Bu çalıĢmada, yüksek kükürt (%5.61) ve kül (%23.09) içerikli Çan linyiti, Na2CO3, NiCl2, Fe2O3, K2CO3 ve Ca(NO3)2 katalizörleri eĢliğinde gazlaĢtırılarak bu katalizörlerin gazlaĢma üzerindeki etkileri toplam gaz hacmi ve hidrojen gazı verimleri açısından değerlendirilerek, en etkin katalizör belirlenmiĢtir. GazlaĢtırma deneyleri atmosferik basınçta, 0.5 mL dk-1 akıĢ hızında gerçekleĢtirilmiĢtir. 700 ºC sıcaklıkta en etkin katalizör Na2CO3 olarak belirlenmiĢtir. 1.0 g kömürün (kuru-külsüz baz) 700ºC’de, %3 Na katalizörü eĢliğinde gazlaĢtırılmasında %74.7 H2 oranı ile 2839 mL gaz elde edilmiĢtir. Optimum katalizör miktarı kullanarak, 600-900 ºC arasındaki farklı sıcaklıklarda gazlaĢtırma deneyleri gerçekleĢtirilerek sıcaklığın gazlaĢma üzerine etkileri incelenmiĢtir. Toplam gaz hacmi ve üretilen hidrojen gazı açısından en yüksek verim, 3033 mL toplam gaz hacmi ve %75.7 H2 oranıyla, 900 ºC sıcaklıkta elde edilmiĢtir.

Keywords

• hidrojen,katalitik gazlaĢtırma,kömür

References

1. Hirsch RL, Gallagher JE, Lessard JRR, Wesselhoft RD, 1982. Catalytic coal gasification: an emerging technology. Science, 215: 121-127
2. Kopyscinski J, Lam J, Mims CA, Hill JM, 2014. K2CO3 Catalyzed Steam Gasification of Ash-Free Coal. Studying the Effect of Temperature on Carbon Conversion and Gas Production Rate Using a Drop-Down Reactor. Fuel, 128: 210-219
3. Kwon TW, Kim JR, Kim SD, Park WH, 1989. Catalytic steam gasification of lignite char. Fuel, 68: 416-421.
4. McKee D, Chatterji D, 1989. The Catalyzed Reaction of Graphite with Water Vapor. Carbon, 16: 53-57
5. Minchener JA, 2005. Coal Gasification for Advanced Power Generation. Fuel, 17: 2222-2235.
6. Mondal K, Piotrowski K, Dasgupta D, Hippo E, Wiltowski T, 2005. Hydrogen from Coal in a Single Step. Industrial&Engineering Chemistry Research, 44: 5508-5517
7. Nishiyama Y, 1986. Catalytic behaviour of iron and nickel in coal gasification Fuel, 65: 1404-1409
8. Ohtsuka Y, Asami K, 1997. Highly Active Catalysts from Inexpensive Raw Materials for Coal Gasification. Catalysis Today, 39: 111-125

9. Popa T, Fan M, Argyle MD, Dyar MD, Gaoa Y, Tang J, Speicher EA, Kammene DM, 2013. H2 and COx Generation from Coal Gasification Catalyzed by a Cost-effective Iron catalyst. Applied Catalysis A: General 464–465: 207–217
10. Popa T, Fan M, Slimane RB, Bell DA, Towler BF, 2013. Catalytic Gasifciation of a Powder River Basin Coal. Fuel, 103: 161-170
11. Stiegel GJ, Ramezan M, 2006. Hydrogen From Coal Gasification: An Economical Pathway to a Sustainable Energy Future. International Journal of Coal Geology, 65: 173 – 190.
12. Takarada T, Tamai Y, Tomita A, 1986. Effectiveness of K2CO3 and Ni as catalysts in steam gasification Fuel 65, (5): 679-683.
13. Tomita A, Ohtsuka Y, Tamai Y, 1983. Low Temperature Gasification of Brown Coals Catalysed by nickel. Fuel, 62 (2): 150-154.
14. Wang J, Sakanishi K, Saito I, 2005. High Yield Hydrogen Production By Steam Gasification Of Hypercoal (Ash Free Coal Extract) with Potassium Carbonate: Comparison with Raw Coal. Energy Fuels, 19 (5): 2114-2120.