WO2005028102A1 - 熱的劣化触媒の再生方法 - Google Patents
熱的劣化触媒の再生方法 Download PDFInfo
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- WO2005028102A1 WO2005028102A1 PCT/JP2004/014131 JP2004014131W WO2005028102A1 WO 2005028102 A1 WO2005028102 A1 WO 2005028102A1 JP 2004014131 W JP2004014131 W JP 2004014131W WO 2005028102 A1 WO2005028102 A1 WO 2005028102A1
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- Prior art keywords
- catalyst
- vanadium oxide
- regenerating
- oxide
- acid
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001172 regenerating effect Effects 0.000 title claims description 19
- 229910001935 vanadium oxide Inorganic materials 0.000 claims abstract description 65
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims abstract description 64
- 230000000694 effects Effects 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims abstract description 26
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 239000004480 active ingredient Substances 0.000 claims abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 12
- 239000011260 aqueous acid Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 239000002912 waste gas Substances 0.000 claims abstract description 5
- 230000007774 longterm Effects 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 39
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 30
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 30
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 29
- 239000002253 acid Substances 0.000 claims description 25
- 239000007864 aqueous solution Substances 0.000 claims description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 229910052785 arsenic Inorganic materials 0.000 claims description 12
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 12
- 239000012670 alkaline solution Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 229910021536 Zeolite Inorganic materials 0.000 claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- 239000010457 zeolite Substances 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 3
- 230000002542 deteriorative effect Effects 0.000 claims description 3
- 238000010306 acid treatment Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 abstract description 29
- 230000008929 regeneration Effects 0.000 abstract description 25
- 230000002776 aggregation Effects 0.000 abstract description 9
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 description 21
- 229910052791 calcium Inorganic materials 0.000 description 21
- 238000010828 elution Methods 0.000 description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 16
- 230000015556 catabolic process Effects 0.000 description 16
- 238000006731 degradation reaction Methods 0.000 description 16
- 239000000126 substance Substances 0.000 description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 10
- 229910052721 tungsten Inorganic materials 0.000 description 10
- 239000010937 tungsten Substances 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 9
- 229910052720 vanadium Inorganic materials 0.000 description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 9
- 238000004220 aggregation Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 239000013543 active substance Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 150000007513 acids Chemical class 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 231100000572 poisoning Toxicity 0.000 description 5
- 230000000607 poisoning effect Effects 0.000 description 5
- 229910052700 potassium Inorganic materials 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910000413 arsenic oxide Inorganic materials 0.000 description 2
- 229960002594 arsenic trioxide Drugs 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 108010070926 Tripeptide aminopeptidase Proteins 0.000 description 1
- 150000001495 arsenic compounds Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229940093920 gynecological arsenic compound Drugs 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- ALTWGIIQPLQAAM-UHFFFAOYSA-N metavanadate Chemical compound [O-][V](=O)=O ALTWGIIQPLQAAM-UHFFFAOYSA-N 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 102000022575 tripeptide aminopeptidase activity proteins Human genes 0.000 description 1
- 150000003658 tungsten compounds Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
- B01J23/22—Vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/60—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/92—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/64—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using alkaline material; using salts
- B01J38/66—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using alkaline material; using salts using ammonia or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/68—Liquid treating or treating in liquid phase, e.g. dissolved or suspended including substantial dissolution or chemical precipitation of a catalyst component in the ultimate reconstitution of the catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
Definitions
- the present invention relates to a method for regenerating and reusing a thermally degraded catalyst.
- a denitration catalyst when used at a high temperature of 350 ° C or more for a long period of time, vanadium oxide as an active ingredient aggregates and causes thermal degradation.
- the present invention is a method that enables regeneration of the thermally deteriorated catalyst.
- the present invention also relates to a method for regenerating a deteriorated catalyst by reducing and removing N 0 X in coal-fired exhaust gas using ammonia.
- a first aspect of the present invention is a catalyst used in a method for reducing and removing NOx in waste gas using ammonia as a reducing agent, and the active ingredient vanadium oxide is used for a long time at a high temperature.
- the catalyst whose activity has been reduced due to the aggregation of the substances is washed with an acid aqueous solution having a pH of 6 or less, preferably pH 4 or less, thereby mainly eluting and removing vanadium oxide, which is an aggregated active component.
- a method for regenerating a thermally degraded catalyst, which comprises re-supporting vanadium oxide as an active ingredient is provided.
- the second one of the present invention is a catalyst used in a method for reducing and removing NOx in waste gas using ammonia as a reducing agent, and the active ingredient vanadium oxide is used for a long time at a high temperature.
- the catalyst whose activity has been reduced due to aggregation, is washed with an aqueous alkaline solution having a pH of 8 or more, preferably pH 10 or more, so that mainly the active components vanadium oxide and tungsten oxide are oxidized. Substances are eluted and removed, and then the carrier component titanium oxide
- the third one of the present invention is a catalyst used in a method for reducing and removing N 0 X in coal-fired exhaust gas using ammonia as a reducing agent, wherein the catalyst having reduced activity is PH 4 or less.
- an aqueous acid solution preferably pH 2 or less, mainly after elution and removal of alkali metal, alkaline earth metal, arsenic and iodide.
- a method for regenerating a deteriorated catalyst comprising reloading and firing a substance and a tungsten oxide.
- Alkali metals which are deteriorating components, are lithium, sodium and the like, and alkaline earth metals are calcium, magnesium and the like.
- the third invention it is preferable to perform a water-washing treatment between the acid treatment, the alkaline treatment, and the active ingredient reloading treatment.
- nitric acid or hydrochloric acid is preferable, and as alkaline, ammonia water is preferable.
- Deterioration of catalyst activity is mainly caused by vanadium supported on titania. There was aggregation of the oxidized oxide, and the decrease in the specific surface area of titania to a certain limit (60 m 2 / g) was not related to the decrease in the activity (see Fig. 1). Therefore, for such a thermally degraded catalyst, it has been found that the catalytic activity can be almost completely regenerated by removing the agglomerated vanadium oxide and reloading the vanadium again.
- the first and second inventions are novel degradation catalyst regeneration methods that combine the above findings.
- the deteriorated catalyst is immersed in a solution (acid solution) having a pH of 6 or less, preferably 4 or less (acid aqueous solution) for 2 hours or more, preferably 4 hours or more to dissolve vanadium oxide mainly supported on the catalyst.
- a solution acid solution
- preferably 4 or less acid aqueous solution
- This operation reduced the activity due to aggregation. Active substances can be removed.
- the specific surface area of the titania carrier that has degenerated cannot be recovered, if the specific surface area after deterioration is 60 m 2 Zg or more, almost 100% activity can be recovered by reloading the active substance.
- the deteriorated catalyst is added to a solution having a pH of 8 or more, preferably 10 or more (aqueous alkaline solution) for 2 hours or more, preferably After immersion for at least 4 hours to elute and remove vanadium oxide and tungsten oxide mainly supported on the catalyst, re-support titania and re-support the active substance, the activity is almost 10 Recovers 0%.
- acids for maintaining the pH value mineral acids other than sulfuric acid, particularly nitric acid and hydrochloric acid, are preferred.
- alkaline ammonia water is preferred. This is because the catalyst surface residue has almost no effect on the activity.
- a catalyst that reduces and removes NOX in coal-fired exhaust gas using ammonia The catalyst whose activity has been reduced is washed mainly with an aqueous acid solution with a pH of 4 or less, preferably pH 2 or less. Elution and removal of calcium, calcium, sodium, arsenic, and iron, which are deteriorating components.
- the catalytically active components vanadium oxide and tungsten oxide are chemically deactivated, the catalyst is washed with an aqueous alkaline solution having a pH of 8 or more, preferably pH HIO or more.
- vanadium oxide and tungsten oxide as active ingredients are eluted and removed.
- vanadium oxide and tungsten oxide as active ingredients are re-supported and calcined.
- washing with an acid aqueous solution is first performed to elute oxides of calcium, calcium, arsenic and zeolite, which are degraded components, and then washing with an aqueous alkaline solution is performed to remove vanadium oxide and tungsten. It is important to elute the oxides. If the order is reversed, the vanadium oxide and tungsten oxide, which have been chemically deactivated, will not be sufficiently eluted.
- a new method for regenerating a deteriorated catalyst was developed by combining the above findings.
- the catalyst whose activity has been reduced is immersed in an acid aqueous solution having a pH of 4 or less, preferably 2 or less, for 2 hours or more, preferably for 4 hours or more, and washed, so that calcium, potassium, which is a degrading component, is mainly contained. Elutes and removes sodium, arsenic and zeolite.
- the catalyst whose catalytically active components, vanadium oxide and tungsten oxide, have been chemically deactivated should be washed with an aqueous alkaline solution having a pH of 8 or more, preferably 10 or more. As a result, vanadium oxide and tungsten oxide as active components are eluted and removed. Then, the vanadium oxide and tungsten oxide as active components are re-supported and fired.
- acids for maintaining the PH value mineral acids other than sulfuric acid, particularly nitric acid and hydrochloric acid, are preferred.
- Ammonia water is preferred as alkali. This is because the catalyst surface residue has almost no effect on the activity.
- the first and second inventions have made it possible to regenerate a thermally degraded catalyst, which was previously impossible. Further, washing with these acid aqueous solution alkaline solutions is an excellent technique without affecting the mechanical strength of the catalyst.
- a large number of deteriorated catalysts can be regenerated by washing with an aqueous acid solution and then with an aqueous alkali solution.
- the binder and the like are not eluted by washing with an acid aqueous solution or an aqueous alkaline solution, and the mechanical strength of the catalyst is not affected.
- Figure 1 is a graph showing the degradation characteristics of catalytic activity.
- Figure 2 shows the types of washing liquid and vanadium oxide and 3 is a graph showing the relationship between the dissolution properties of oxides.
- Figure 3 is a graph showing the relationship between the pH of the washing solution and the elution properties of vanadium oxide and tandatin oxide.
- Figure 4 is a graph showing the performance of the catalyst before and after regeneration.
- Figure 5 is a graph showing the performance of a catalyst reloaded with vanadium oxide and tungsten before and after regeneration.
- FIG. 6 is a graph showing the relationship between the pH of the washing solution and the elution properties of calcium and calcium.
- FIG. 7 is a graph showing the performance of a catalyst reloaded with vanadium oxide and tungsten before and after regeneration.
- FIG. 8 is a graph showing the relationship between the pH of the washing solution and the elution properties of arsenic oxide and sulfur oxide.
- Figure 9 is a graph showing the catalyst performance after regenerating the arsenic-degraded catalyst.
- FIG. 10 is a graph showing the performance of a catalyst in which vanadium oxide and tungsten are re-supported.
- FIG. 11 is a graph showing the performance of the catalyst in Comparative Example 1 in which vanadium oxide and tungsten were re-supported.
- vanadium oxide and tungsten oxide are supported on the carrier precursor under the same conditions as above, and then calcined at 580 ° C for various times to thermally degrade the specific surface area.
- a catalyst was prepared. The performance of this catalyst is shown in FIG.
- the difference between the performance change characteristics of the two catalysts suggests that the decrease in thermal activity is not due to a decrease in the specific surface area of the support, but to agglomeration of the supported vanadium oxide.
- the thermal degradation catalyst described in the section (1) Thermal degradation was immersed in various cleaning liquids for 5 hours, and the elution properties of the active substances, vanadium oxide and tungsten oxide, were observed.
- Figure 2 shows the results.
- Fig. 3 shows the relationship between the washing solution hydrogen ion concentration ( ⁇ ) and the elution property.
- the thermal degradation catalyst described in the section (1) Thermal degradation above was immersed in a nitric acid solution of PH 1.2 for 5 hours to elute and remove the vanadium oxide, and then the vanadium oxide was supported again under the same conditions. A regenerated catalyst was prepared by using this method, and its performance was compared. Fig. 4 shows the results. Performance almost equal to the initial performance was obtained.
- the deterioration of the activity of the catalyst is caused by aggregation of vanadium oxide supported on the titania surface.
- Table 1 shows the compressive strength ratio before and after the catalyst regeneration shown in (3) Regeneration of thermal degradation catalyst. From Table 1, it can be seen that no reduction in compression strength was observed due to catalyst regeneration. In Table 1, Compressive strength ratio-Compressive strength after playback Compressive strength before playback.
- This catalyst is referred to as Catalyst 1.
- the thermally degraded catalyst (titania specific surface area: 40 gZm 2 ) in the actual plant was immersed in an aqueous NH 3 solution of ⁇ .5 for 5 hours to elute and remove vanadium oxide and tungsten. , And then the vanadium oxide and tungsten were re-supported.
- This catalyst is referred to as Catalyst 2.
- the performance of catalyst 1 and catalyst 2 were compared.
- Figure 5 shows the results. According to Fig. 5, the coagulation of the carrier, titania, occurred at the same time as the coagulation of the vanadium oxide. It can be seen that the initial performance can be almost recovered by reloading tungs
- a carrier was prepared.
- the carrier 0.0 3 mol / Li Tsuta of meta vanadate Anmoniumu (NH 4 V 0 3) 3 immersed 0 minutes in an aqueous solution, dried and calcined, vanadium oxide adsorbed supported.
- Ide which 1 5 wt% of 0 3 aqueous solution 3 0 minutes immersion, drying and then fired to prepare denitration catalyst.
- This denitration catalyst was instantaneously impregnated with an aqueous solution containing K 0 H and Ca (N 0 3 ) 2, and calcined at 400 ° C. for 3 hours to prepare a simulated catalyst.
- the catalyst was immersed in each aqueous solution of the washing solution for 5 hours, and the elution of the degrading substances K and Ca was measured.
- Figure 6 shows the results. From Fig. 6, it can be seen that the elution of alkaline substances depends on the pH of the cleaning solution regardless of the type of cleaning solution, and most of the alkaline substances elute when immersed in a low pH cleaning solution.
- the initial activity of the denitration catalyst was measured, and each was poisoned with K and Ca aqueous solution concentrations, and the activity after poisoning was measured.
- vanadium oxide and tungsten oxide were supported to regenerate the alkali-degraded catalyst, and the performance was compared.
- the result is shown in FIG. From Fig. 7, it can be seen that the performance almost recovered to the initial performance.
- the numerical value in parentheses attached to K or Ca indicates the concentration (mol / litre) of K or Ca in the impregnating solution.
- This catalyst was exposed to air containing arsenic oxide vapor of about 25 ppm as As for 4 hours at 350 ° C to degrade its performance, and a simulated arsenic-degraded catalyst was prepared.
- This catalyst was immersed in each aqueous acid solution as a washing solution for 5 hours, and the elution property of As, a poisoning substance, was measured.
- Figure 8 shows the results.
- the elution property of arsenic substances depends on the pH of the cleaning solution irrespective of the type of the cleaning solution, and it can be seen that most of the arsenic elutes when immersed in a cleaning solution with a low pH.
- the initial activity of the standard denitration catalyst was measured, and the catalyst was exposed to the arsenic vapor for 4 hours (catalyst A) or 6 hours (catalyst B) to be poisoned, and the activity after poisoning was measured. Furthermore, it was immersed in a nitric acid solution of pH 1.3 for 5 hours, and then immersed in an NH 3 aqueous solution of pH 0.5 for 5 hours to elute and remove vanadium oxide and tungsten.
- the arsenic-degrading catalyst was regenerated by carrying vanadium oxide and tandasten oxide under the following conditions, and the performance was compared. The results are shown in FIG. From Fig. 9, it can be seen that the performance recovers to almost the initial performance.
- No. l and No. 2 indicate different coal-fired emissions.
- Regeneration was performed in the same manner as in Example 2, (3), except that the order of washing with acid and alcohol was reversed in the section of (3) Regeneration of actual deteriorated catalyst in Example 2.
- the present invention provides a method that enables regeneration of a thermally degraded catalyst
Abstract
Description
Claims
Priority Applications (2)
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US10/572,310 US20080248943A1 (en) | 2003-09-18 | 2004-09-21 | Method of Regenerating Thermally Deteriorated Catalyst |
KR1020067005210A KR101096938B1 (ko) | 2003-09-18 | 2004-09-21 | 열적 열화 촉매의 재생 방법 |
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JP2003-325665 | 2003-09-18 | ||
JP2003325665A JP4264642B2 (ja) | 2003-09-18 | 2003-09-18 | 熱的劣化触媒の再生方法 |
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PCT/JP2004/014131 WO2005028102A1 (ja) | 2003-09-18 | 2004-09-21 | 熱的劣化触媒の再生方法 |
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US (1) | US20080248943A1 (ja) |
JP (1) | JP4264642B2 (ja) |
KR (1) | KR101096938B1 (ja) |
WO (1) | WO2005028102A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1949958A3 (en) * | 2007-01-24 | 2011-05-11 | Societa' Italiana Acetilene & Derivati S.I.A.D. S.p.A. in abbreviated form SIAD S.p.A. | Process for regeneration of photoactivated catalysts used for treatment of liquid or gaseous effluents |
CN104411688A (zh) * | 2012-07-10 | 2015-03-11 | 西门子医疗保健诊断公司 | 由9,10-二氢吖啶的n-烷基化合成吖啶鎓化合物 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5723646B2 (ja) * | 2011-03-25 | 2015-05-27 | 日立造船株式会社 | 脱硝触媒の調製方法 |
WO2012150816A2 (ko) * | 2011-05-02 | 2012-11-08 | 한서대학교 산학협력단 | 중질유 수소화처리를 위한 재생 또는 재제조 촉매 및 그의 제조방법 |
KR102102044B1 (ko) * | 2018-08-20 | 2020-04-23 | 주식회사 세일에프에이 | 유해가스 제거용 촉매가 함유된 펠릿 조성물의 제조 및 이의 재활용 방법 |
KR102191455B1 (ko) * | 2019-04-09 | 2020-12-15 | 주식회사 세일에프에이 | 유해가스 제거용 촉매의 제조 및 재활용 방법 |
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JPS5410294A (en) * | 1977-06-27 | 1979-01-25 | Mitsubishi Chem Ind Ltd | Regenerating method for used vanadium-titania catalyst |
JPS5688828A (en) * | 1979-12-19 | 1981-07-18 | Mitsubishi Heavy Ind Ltd | Treatment of catalyst composition |
JPS57180433A (en) * | 1981-04-28 | 1982-11-06 | Mitsubishi Heavy Ind Ltd | Regeneration of used denitration catalyst |
JPS61102232A (ja) * | 1984-10-26 | 1986-05-20 | Diafoil Co Ltd | 包装用ポリエステルフィルム |
JP2000037635A (ja) * | 1998-07-24 | 2000-02-08 | Mitsubishi Heavy Ind Ltd | 脱硝触媒の再生方法 |
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DE2552456C3 (de) * | 1975-11-22 | 1978-05-18 | Bayer Ag, 5090 Leverkusen | Verfahren zum Regenerieren von verbrauchten, Vanadinoxyd enthaltenden Oxydationskatalysatoren |
US4784980A (en) * | 1987-07-15 | 1988-11-15 | Amoco Corporation | Process for preparing zeolite A from spent cracking catalyst |
DE4200248A1 (de) * | 1992-01-08 | 1993-07-15 | Basf Ag | Verfahren zur regenerierung von metalloxid-katalysatoren |
US5928980A (en) * | 1997-02-06 | 1999-07-27 | Research Triangle Institute | Attrition resistant catalysts and sorbents based on heavy metal poisoned FCC catalysts |
US6395665B2 (en) * | 1998-07-24 | 2002-05-28 | Mitsubishi Heavy Industries, Ltd. | Methods for the regeneration of a denitration catalyst |
CN1223404C (zh) * | 2001-02-13 | 2005-10-19 | Sk株式会社 | 选择性催化还原氮氧化物的催化剂及其制备方法 |
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- 2003-09-18 JP JP2003325665A patent/JP4264642B2/ja not_active Expired - Fee Related
-
2004
- 2004-09-21 KR KR1020067005210A patent/KR101096938B1/ko not_active IP Right Cessation
- 2004-09-21 US US10/572,310 patent/US20080248943A1/en not_active Abandoned
- 2004-09-21 WO PCT/JP2004/014131 patent/WO2005028102A1/ja active Application Filing
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JPS5410294A (en) * | 1977-06-27 | 1979-01-25 | Mitsubishi Chem Ind Ltd | Regenerating method for used vanadium-titania catalyst |
JPS5688828A (en) * | 1979-12-19 | 1981-07-18 | Mitsubishi Heavy Ind Ltd | Treatment of catalyst composition |
JPS57180433A (en) * | 1981-04-28 | 1982-11-06 | Mitsubishi Heavy Ind Ltd | Regeneration of used denitration catalyst |
JPS61102232A (ja) * | 1984-10-26 | 1986-05-20 | Diafoil Co Ltd | 包装用ポリエステルフィルム |
JP2000037635A (ja) * | 1998-07-24 | 2000-02-08 | Mitsubishi Heavy Ind Ltd | 脱硝触媒の再生方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1949958A3 (en) * | 2007-01-24 | 2011-05-11 | Societa' Italiana Acetilene & Derivati S.I.A.D. S.p.A. in abbreviated form SIAD S.p.A. | Process for regeneration of photoactivated catalysts used for treatment of liquid or gaseous effluents |
CN104411688A (zh) * | 2012-07-10 | 2015-03-11 | 西门子医疗保健诊断公司 | 由9,10-二氢吖啶的n-烷基化合成吖啶鎓化合物 |
CN104411688B (zh) * | 2012-07-10 | 2019-01-08 | 西门子医疗保健诊断公司 | 由9,10-二氢吖啶的n-烷基化合成吖啶鎓化合物 |
Also Published As
Publication number | Publication date |
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US20080248943A1 (en) | 2008-10-09 |
JP2005087900A (ja) | 2005-04-07 |
KR101096938B1 (ko) | 2011-12-22 |
KR20060080198A (ko) | 2006-07-07 |
JP4264642B2 (ja) | 2009-05-20 |
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