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Applications and characteristics:
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 JZ205 type thermal-shielding catalyst is prepared by high temperature calcination, which contains a small amount of nickel as its active component and alumina as its support. It is used in the top part of the secondary reformer of the large and medium sized ammonia plants as a thermal shield for Z204 type catalyst. Its performance is well adapted to the specific operating environment and conditions in the top of the secondary reformer. Furthermore, it is more resistant to high temperature and gas impingement.
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Physical property and chemical composition:
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Apparent color and Shape: tile- gray ring
Size (outer dia. * height * inner dia.) mm: 25×17×9
Other sizes and shapes available on request.
Bulk density: 1.00～1.15Kg／L
Chemical composition，%(m/m)
Composition： NiO(%) Al2O3 SiO2 Fe2O3 K2O+Na2O Additives
Content： ≥5.5 ～90.00 ≤0.20 ≤0.35 <0.30 little
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Technical standard:
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Granular radial crush strength (avg): ≥400N／gr
Percentage of low-strength granular (< 200N/gr): ≤5.0%
Heat resistance: It offers a long-term on stream service at 1350℃ and a stable structure during operation at high temperatures. Itcan be subjected to thermal shocks ang will not cake when operated at 1450℃. Besides, it is characterized by good resistance to sudden heat and cold.
Activity inspection: JZ205 type catalyst principally provides thermal shielding for the secondary reforming catalyst. The activity of Z205 type catalyst is not the main factor, but its heat resistance and strength are the key criteria. It is, therefore, unnecessary to inspect its activity according to the respective regulations of HG 2273.3-2004 .
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Requirements for feedstock and poison:
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1、Sulfur is the major poison for nickel-based catalyst。It is required that sulfur content in feed gas to the reformer tube as low as possible, normally＜0.5ppm，preferably＜0.2ppm。 .
2 .Chlorine and other halogens may poison the catalyst, and it is difficult for the poisoned catalyst to restore its activity. Hence, the lower the chlorine content in feed gas, the better.
3、Arsenic may bring about a permanent deactivation of catalyst, and there should not be any arsenic in feed gas。
4、The steam used should not contain any condensable liquids or chemicals used for treating boiler feed-water besides chlorine and arsenic. |
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Requirements for feedstock and poison:
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Sulfur is the major poison for Z205 type thermal shield.it is required that sulfur content in feed gas to the reformer be as low as possible, normally <0.5ppm, preferably <0.2ppm. Chlorine and other halogens may poison the thermal shield as well, and it is difficult for the poisoned thermal shield to restore its activity. Hence, the lower the chlorine content in feed gas, the better. Arsenic may cause the thermal shield to deactivate permanently, and feed gas should not contain any arsenic Feed gas is not allowed to contain such poisons as copper, lead,etc. which may make catalyst activity decrease as well. the steam used is not allowed to contain any condensable liquids and chemicals used for treating boiler feed-water. |
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Storage and transportation:
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The same with common catalyst |
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Technical support:
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“Quality first, customer supreme” is our objective. We provide the thorough service for our customers wholeheartedly. We can send technology engineers to the site according to your needs. |
