CN107913728B - Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft - Google Patents
Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft Download PDFInfo
- Publication number
- CN107913728B CN107913728B CN201711079914.1A CN201711079914A CN107913728B CN 107913728 B CN107913728 B CN 107913728B CN 201711079914 A CN201711079914 A CN 201711079914A CN 107913728 B CN107913728 B CN 107913728B
- Authority
- CN
- China
- Prior art keywords
- zsm
- inerting
- molecular sieve
- fuel tank
- aircraft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/42—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing iron group metals, noble metals or copper
- B01J29/44—Noble metals
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
- B01J20/186—Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
Abstract
The invention relates to application of a Pt/M-ZSM-5 molecular sieve in inerting and explosion prevention of an aircraft fuel tank, which can be used for a green airborne inert gas generation system and can realize complete inerting of an oil-gas mixture as a fuel tank inerting catalyst.
Description
Technical Field
The invention relates to the technical field of fuel tank inerting explosion prevention, in particular to application of a Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of an aircraft fuel tank.
Background
The occurrence of fire or explosion in the fuel tanks of an aircraft has always been one of the major threats to aviation safety. When fuel vapor is mixed with a certain amount of air in the fuel tank, it may be ignited to cause explosion by the influence of equipment failure or external attack during flight.
The 1996 TWA Flight 800 Flight had an air crash in the long island channel and resulted in 230 deaths, after which the technical report confirmed that the breakup of this boeing 747-. To avoid reoccurrence of such accidents, the united states Federal Aviation Administration (FAA) is working to find ways to improve the safety of fuel tanks of commercial transport aircraft. Other authoritative airworthiness authorities in the world, such as the European Aviation Security Agency (EASA) and the Civil Aviation Agency (CAAC), have continually established mandatory regulatory requirements to reduce the flammability of fuel tanks for commercial aircraft.
At present, a plurality of methods for preventing explosion in an aircraft fuel tank exist, and the common methods for preventing the explosion of the fuel tank are generally divided into two methods, namely filling an explosion-proof material in the fuel tank and inerting an oil-gas mixture in the fuel tank. The common filling explosion-proof material mainly comprises a nonmetal foam barrier explosion-proof material and a metal barrier explosion-proof material, wherein the nonmetal foam barrier explosion-proof material and the metal barrier explosion-proof material are mainly in a spongy structure made of foam plastics, so that the diffusion of flame in the fuel tank can be inhibited, and the explosion of the fuel tank is further prevented. However, the material itself has a high retention rate and lacks hydrolytic stability, and there are problems such as clogging of the filter and contamination of fuel when used for a long time. The metal barrier explosion-proof material mainly adopts an aluminum alloy mesh material, the mesh structure can mainly divide the fuel tank into a plurality of small chambers, if the fuel tank is on fire, the small chambers can play a damping role, and the aluminum alloy mesh material has good heat conductivity, so that the local high temperature of a fire area can be rapidly diffused, and further the explosion of the fuel tank is prevented. The aluminum alloy barrier explosion-proof material has obvious explosion suppression effect, but is easy to generate electrolytic reaction to block an oil pump, and the maintenance cost is higher.
Compared to the above-mentioned idea, inerting the oil-gas mixture is an economical and efficient method. In 2004, the company Phyre, usa, developed a new type of tank inerting system. The system does not need to use an engine for air bleed, has no moving parts except a low-pressure pump, is light in weight and low in power consumption, does not generate pollution gas in the process, and is called a green onboard inert gas generation system (GOBIGGS). In the inerting system, the design and preparation of the fuel gas complete inerting catalyst are the key for determining the performance of the inerting system under the condition of lower temperature. However, the research work in the related field is still in the beginning stage, and further optimization and perfection are needed.
Disclosure of Invention
The invention aims to provide an application of a Pt/M-ZSM-5 molecular sieve in inerting and explosion prevention of an aircraft fuel tank, aiming at the defects of the prior art.
The technical scheme provided by the invention is as follows:
an application of a Pt/M-ZSM-5 molecular sieve in inerting and explosion prevention of an aircraft fuel tank is disclosed, wherein M is H, Na, K or Cs.
As more M, such as hydrogen ions, sodium ions, potassium ions or cesium ions, exist in the Pt/M-ZSM-5 molecular sieve, the Pt/M-ZSM-5 molecular sieve can generate synergistic action with platinum, so that the formation of reaction sites is promoted to a certain extent. On the other hand, the existence of more M can regulate and control the hydrophobicity, further strengthen the hydrophobic property of the carrier, ensure that the carrier can strengthen the adsorption of fuel gas and accelerate the desorption of reaction product water. Therefore, the catalyst shows excellent inerting performance of oil-gas mixture, and has the advantages of low temperature in the operation process, high reaction efficiency and the like.
The preparation method of the Pt/M-ZSM-5 molecular sieve is disclosed in spring rain, zeolite molecular sieve Pt-loaded Volatile Organic Compounds (VOCs) catalytic elimination [ D ]. Zhejiang university, 2015.
The invention also provides an application of the Pt/M-ZSM-5 molecular sieve as an aircraft fuel tank inerting catalyst, wherein M is H, Na, K or Cs.
The invention also provides application of the Pt/M-ZSM-5 molecular sieve as a fuel tank inerting catalyst in a green airborne inert gas generation system, wherein M is H, Na, K or Cs.
The catalytic gas treatment unit is a core component in a green airborne inert gas generation system, the Pt/M-ZSM-5 molecular sieve can be placed in the catalytic gas treatment unit, fuel steam is completely inerted at a lower temperature, water vapor generated in the inerting process is removed after condensation, and carbon dioxide can circularly participate in the inerting process of the fuel steam, so that the aim of preventing the fuel tank from burning or exploding is fulfilled.
Among them, green onboard inert gas generation systems have been disclosed in liu obstinate spring, cuzu masson dual, a new aircraft tank catalytic inerting system [ J ] aeronautics and sciences, 2011(4):27-29.
The invention also provides an application of the Pt/M-ZSM-5 molecular sieve in the decomposition of methylcyclohexane, wherein M is H, Na, K or Cs.
Preferably, the Pt/M-ZSM-5 molecular sieve has the following decomposition conditions when decomposing methylcyclohexane: the concentration of the methyl cyclohexane gas is 800-2000ppm, the reaction volume space velocity is 3000-12000mL/(gh), the mass of the Pt/M-ZSM-5 molecular sieve is 50-500mg, and the flow rate of the reaction gas is set to be 50-200 mL/min.
Preferably, the Pt/M-ZSM-5 molecular sieve is a Pt/Na-ZSM-5 molecular sieve.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention discloses a new application of a Pt/M-ZSM-5 molecular sieve, which can be used for inerting and explosion prevention of an aircraft fuel tank.
(2) The Pt/M-ZSM-5 molecular sieve has excellent inerting performance of oil-gas mixtures, and has the advantages of low temperature in the operation process, high reaction efficiency and the like.
Drawings
FIG. 1 is an SEM picture of a Pt/Na-ZSM-5 molecular sieve prepared in example 1;
FIG. 2 is an XRD pattern of the Pt/Na-ZSM-5 molecular sieves prepared in examples 1-3;
FIG. 3 is a test chart of fuel inerting gas generation performance of examples 1 to 3, comparative example and blank example.
Detailed Description
The invention is further illustrated by the following specific examples, in which some of the preparation conditions are merely exemplary and not intended to limit the invention.
Example 1: preparation of Pt/Na-ZSM-5 molecular sieve
Stirring 0.068g of sodium metaaluminate and 7.2mL of water for dissolving, adding 10.17mL of 40% tetrapropylammonium hydroxide solution, dropwise adding 9.74mL of tetraethyl silicate, continuously stirring for 4 hours, then transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 3 days, centrifuging after the crystallization is finished, fully washing, drying and demolding, adding a certain amount of tetramine platinum nitrate solution to enable the load of Pt to be 1% by weight, stirring, performing ultrasonic treatment for 2 hours, slowly volatilizing water by using an evaporating dish, drying, and roasting again for 4 hours at 350 ℃ to obtain a Pt/Na-ZSM-5 molecular sieve sample.
Example 2: preparation of Pt/Na-ZSM-5 molecular sieve
Stirring 0.062g sodium metaaluminate and 5.85mL water for dissolving, adding 15.3mL 40% tetrapropylammonium hydroxide solution, dropwise adding 19.47mL tetraethyl silicate, continuously stirring for 4 hours, transferring to a hydrothermal reaction kettle for crystallization at 180 ℃ for 2 days, centrifuging after the crystallization is finished, fully washing, demolding, adding a certain amount of tetramine platinum nitrate solution to enable the Pt loading capacity to be 1% wt, stirring for 3 hours at room temperature, dipping overnight, slowly volatilizing water by using an evaporating dish, drying, and roasting again for 4 hours at 400 ℃ to obtain a Pt/Na-ZSM-5 molecular sieve sample.
Example 3: preparation of Pt/Na-ZSM-5 molecular sieve
Stirring 0.082g sodium metaaluminate with 5.40mL water for dissolving, adding 20.34mL 40% tetrapropyl ammonium hydroxide solution, dropwise adding 19.47mL tetraethyl silicate, continuously stirring for 4 hours, transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 5 days, centrifuging after the crystallization is finished, fully washing, demolding, adding a certain amount of tetramine platinum nitrate solution to enable the Pt load to be 1% wt, stirring, carrying out ultrasonic treatment for 2 hours, slowly volatilizing water by using an evaporating dish, drying, roasting again at 500 ℃ for 6 hours to obtain a Pt/Na-ZSM-5 molecular sieve sample
Example 4: preparation of Pt/H-ZSM-5 molecular sieve
Stirring 0.068g of sodium metaaluminate with 7.2mL of water for dissolving, adding 10.17mL of 40% tetrapropylammonium hydroxide solution, dropwise adding 9.74mL of tetraethyl silicate, continuously stirring for 4 hours, then transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 3 days, centrifuging after the crystallization is finished, fully washing, drying and demolding. Taking a certain amount of the NaZSM-5 synthesized above in 50mL of 1M NH4NO3The solution was stirred at 80 ℃ for 3 hours. And centrifuging, washing, drying and calcining at 550 ℃ to obtain the HZSM-5 sample. Adding a certain amount of tetramine platinum nitrate solution to enable the Pt loading amount to be 1 wt%, stirring, carrying out ultrasonic treatment for 2 hours, slowly volatilizing water by using an evaporating dish, drying, and roasting again for 4 hours at 350 ℃ to obtain a Pt/H-ZSM-5 molecular sieve sample.
Example 5: preparation of Pt/K-ZSM-5 molecular sieve
Stirring 0.068g of sodium metaaluminate with 7.2mL of water for dissolving, adding 10.17mL of 40% tetrapropylammonium hydroxide solution, dropwise adding 9.74mL of tetraethyl silicate, continuously stirring for 4 hours, then transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 3 days, centrifuging after the crystallization is finished, fully washing, drying and demolding. A certain amount of the NaZSM-5 synthesized above was stirred in 50mL of 1mol/L KCl solution at 80 ℃ for 3 hours. And centrifuging, washing and drying to obtain the HZSM-5 sample. Adding a certain amount of tetramine platinum nitrate solution to enable the Pt loading amount to be 1 wt%, stirring, carrying out ultrasonic treatment for 2 hours, slowly volatilizing water by using an evaporating dish, drying, and roasting again for 4 hours at 350 ℃ to obtain a Pt/K-ZSM-5 molecular sieve sample.
Example 6: preparation of Pt/Cs-ZSM-5 molecular sieve
Stirring 0.068g of sodium metaaluminate with 7.2mL of water for dissolving, adding 10.17mL of 40% tetrapropylammonium hydroxide solution, dropwise adding 9.74mL of tetraethyl silicate, continuously stirring for 4 hours, then transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 3 days, centrifuging after the crystallization is finished, fully washing, drying and demolding. A certain amount of the NaZSM-5 synthesized above was stirred in 50mL of a 1mol/L CsCl solution at 80 ℃ for 3 hours. And centrifuging, washing and drying to obtain the HZSM-5 sample. Adding a certain amount of tetramine platinum nitrate solution to enable the Pt loading amount to be 1 wt%, stirring, carrying out ultrasonic treatment for 2 hours, slowly volatilizing water by using an evaporating dish, drying, and roasting again for 4 hours at 350 ℃ to obtain a Pt/Cs-ZSM-5 molecular sieve sample.
Comparative example: preparation of Na-ZSM-5 molecular sieve
Stirring 0.068g of sodium metaaluminate and 7.2mL of water for dissolving, adding 10.17mL of 40% tetrapropylammonium hydroxide solution, dropwise adding 9.74mL of tetraethyl silicate, continuously stirring for 4 hours, transferring to a hydrothermal reaction kettle for crystallization at 170 ℃ for 3 days, centrifuging after the crystallization is finished, fully washing, drying and demolding to obtain a Na-ZSM-5 molecular sieve sample.
Characterization experiment:
the Pt/Na-ZSM-5 molecular sieve prepared in example 1 was characterized by SEM, as shown in FIG. 1, which shows that the molecular sieves all have uniform morphology and crystal size of about 200 nm.
An XRD characterization is adopted for the Pt/Na-ZSM-5 molecular sieve samples prepared in examples 1 to 3, as shown in fig. 2, characteristic peaks of the MFI type molecular sieve appear at all 2 θ ═ 7.96 °, 8.83 °, 23.18 °, 23.99 °, and 24.45 °, which indicates that the framework result of the molecular sieve carrier is very stable in the preparation processes of catalyst impregnation, calcination, high-temperature reduction, and the like, and characteristic peaks of the supported noble metal Pt appear at 2 θ ═ 39.8 °, and 46.2 °, which indicates that the noble metal Pt is successfully supported on the molecular sieve.
Application example 1: fuel inerting gas generation performance test
The catalysts prepared in examples 1-3 and comparative examples were selected for performance testing. Blank examples are added, and no catalyst is added during performance testing.
Inerting performance test conditions: 1000ppm methylcyclohexane gas with a carrier gas of 21% O2And 79% N2The space velocity of the reaction volume is 6000 mL/(g.h). The inerting performance was measured by taking 0.1g of the above sample, and setting the reaction gas flow rate at 100 ml/min.
All catalyst samples were calcined in an air atmosphere at 300 ℃ for 3 hours before being subjected to the inerting performance test for the purpose of catalyst activation.
As shown in FIG. 3, Pt/M-ZSM-5 has a significant catalytic effect on the inerting of methylcyclohexane. In the case of the blank, the inerting gas generation rate of methylcyclohexane was only 8% at 200 ℃ in the absence of the catalyst, and in the case of Na-ZSM-5, the inerting effect of methylcyclohexane slightly increased, but the inerting gas generation rate was also only 12% at 200 ℃. When Pt/M-ZSM-5 exists, the inerting effect of the methylcyclohexane is obviously improved, and the complete inerting of the methylcyclohexane can be realized at the temperature of 180-250 ℃. Thus, Pt/M-ZSM-5 has a significant inerting effect on methylcyclohexane.
Application example 2: application of catalyst as fuel tank inerting catalyst in green airborne inert gas generation system
The catalytic gas treatment unit is a core component in a green onboard inert system, a Pt/M-ZSM-5 catalyst can be placed in the catalytic gas treatment unit to ensure that fuel steam is completely inerted at a lower temperature, water vapor generated in the inerting process is removed after condensation, and carbon dioxide can circularly participate in the inerting process of the fuel steam, so that the aim of preventing the fuel tank from burning or exploding is fulfilled.
Claims (1)
1. The application of a Pt/M-ZSM-5 molecular sieve in decomposing methylcyclohexane, wherein M is Na, and the complete inerting temperature of the methylcyclohexane is 180-250 ℃;
the Pt/M-ZSM-5 molecular sieve was calcined at 300 ℃ for 3 hours in an air atmosphere before use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711079914.1A CN107913728B (en) | 2017-11-06 | 2017-11-06 | Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711079914.1A CN107913728B (en) | 2017-11-06 | 2017-11-06 | Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107913728A CN107913728A (en) | 2018-04-17 |
| CN107913728B true CN107913728B (en) | 2020-03-31 |
Family
ID=61895169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711079914.1A Active CN107913728B (en) | 2017-11-06 | 2017-11-06 | Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107913728B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112916038B (en) * | 2019-12-06 | 2022-03-08 | 中国科学院大连化学物理研究所 | Fuel steam catalytic oxidation deoxidation Pt/M-Y catalyst and preparation and application thereof |
| CN112916039B (en) * | 2019-12-06 | 2022-02-01 | 中国科学院大连化学物理研究所 | Gaseous hydrocarbon catalytic oxidation deoxidation Pt/Beta catalyst and preparation and application thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7694916B2 (en) * | 2005-07-08 | 2010-04-13 | Phyre Technologies Inc. | Catalytic reactive component reduction system and methods for the use thereof |
-
2017
- 2017-11-06 CN CN201711079914.1A patent/CN107913728B/en active Active
Non-Patent Citations (3)
| Title |
|---|
| Promotional Effects of Mesoporous Zeolites with Pt Nanoparticle Catalysts during Reforming of Methylcyclopentane;Kyungsu Na等;《J. Phys. Chem. A》;20140428;第118卷;第8446-8452页 * |
| VOCs combustion catalysed by platinum supported on manganese octahedral molecular sieves;Sanz O等;《APPLIED CATALYSIS B-ENVIRONMENTAL》;20111102;第110卷;第231-237页 * |
| 甲基环己烷催化裂化的研究进展;张旭等;《石油化工》;20130115;第42卷(第1期);第104-110页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107913728A (en) | 2018-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107913728B (en) | Application of Pt/M-ZSM-5 molecular sieve in inerting explosion prevention of fuel tank of aircraft | |
| CN104941695A (en) | Nano ZSM-5 molecular sieve based catalyst and preparation and use methods | |
| Niu et al. | High selectivity for n-dodecane hydroisomerization over highly siliceous ZSM-22 with low Pt loading | |
| CN103372456A (en) | Molecular sieve based catalyst and preparation and application thereof | |
| Chaihad et al. | Preparation of various hierarchical HZSM-5 based catalysts for in-situ fast upgrading of bio-oil | |
| CN112044401A (en) | Porous organic cage adsorbing material and preparation method thereof | |
| KR20210010901A (en) | Stable CHA zeolite | |
| US10745145B2 (en) | Contaminant removal for catalytic fuel tank inerting system | |
| CN105712373B (en) | A kind of Modified Zeolite Y and preparation method thereof | |
| CN107344720B (en) | A kind of Y type molecular sieve and preparation method thereof | |
| CN105536695B (en) | A kind of adsorbent and preparation method of adsorbing separation polycyclic aromatic hydrocarbon | |
| CN105195172A (en) | In-situ synthesis method for light-hydrocarbon aromatization catalyst | |
| CN111604086B (en) | Preparation method and application of platinum-based normal paraffin aromatization catalyst | |
| CN105032476A (en) | Biological alkane hydroisomerization catalyst, preparation method and applications thereof | |
| EP3326995B1 (en) | Method for preparing acetal carbonyl compound | |
| CN107029764A (en) | A kind of preparation method and application of support type P Modification palladium catalyst | |
| US3804780A (en) | Catalyst of zinc-rare earth exchanged zeolite | |
| CN105013434A (en) | Transformer deteriorated oil adsorbent and preparation method thereof | |
| CN112916038B (en) | Fuel steam catalytic oxidation deoxidation Pt/M-Y catalyst and preparation and application thereof | |
| CN112916039B (en) | Gaseous hydrocarbon catalytic oxidation deoxidation Pt/Beta catalyst and preparation and application thereof | |
| CN105642289A (en) | Preparation method of catalyst for complete methanation of syngas | |
| CN105540605B (en) | A kind of method of synthesizing aluminum-enriched Beta zeolites | |
| CN105621439B (en) | A kind of synthetic method of Beta zeolites | |
| CN111111750B (en) | Catalyst for green inerting system of aircraft fuel tank and preparation method thereof | |
| KR970009880A (en) | Composite metal catalyst composition for dehydrogenation reaction and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |