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  <xs:element id="apd_FinancingAndLeaseArrangementMember" abstract="true" name="FinancingAndLeaseArrangementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="apd_SitesOnWhichFinalSettlementHasNotBeenReached" abstract="false" name="SitesOnWhichFinalSettlementHasNotBeenReached" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="apd_PayoutPeriod" abstract="false" name="PayoutPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="apd_ShareBasedCompensationArrangementByAwardOtherThanOptionsPaidInPeriodTotalFairValue" abstract="false" name="ShareBasedCompensationArrangementByAwardOtherThanOptionsPaidInPeriodTotalFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ShareBasedPaymentArrangementExerciseOfOptionTaxBenefitComponentOfExcessTaxBenefit" abstract="false" name="ShareBasedPaymentArrangementExerciseOfOptionTaxBenefitComponentOfExcessTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayOutsInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayOutsInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="apd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAveragePayOutDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAveragePayOutDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="apd_IncomeTaxDisclosuresTable" abstract="true" name="IncomeTaxDisclosuresTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="apd_IncomeTaxDisclosuresLineItems" abstract="true" name="IncomeTaxDisclosuresLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="apd_IncomeTaxPaidTaxCredit" abstract="false" name="IncomeTaxPaidTaxCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_RestructuringChargesIncludingEquityAffiliateIncome" abstract="false" name="RestructuringChargesIncludingEquityAffiliateIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_DeferredTaxAssetsFutureDispositionOfForeignSubsidiaries" abstract="false" name="DeferredTaxAssetsFutureDispositionOfForeignSubsidiaries" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_EffectiveIncomeTaxRateReconciliationTaxCreditsNetOfRepatriationOfForeignEarnings" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditsNetOfRepatriationOfForeignEarnings" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_ShareholderActivismCostsNetTaxBenefit" abstract="false" name="ShareholderActivismCostsNetTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsNonrecurringBenefitForUSTaxOnForeignDividends" abstract="false" name="TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsNonrecurringBenefitForUSTaxOnForeignDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_UnrecognizedTaxBenefitsIncreaseResultingFromTaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsRefundClaim" abstract="false" name="UnrecognizedTaxBenefitsIncreaseResultingFromTaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsRefundClaim" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_TaxCreditsAndOtherTaxCarryforwards" abstract="false" name="TaxCreditsAndOtherTaxCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ForeignLossCarryforwardsMember" abstract="true" name="ForeignLossCarryforwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ForeignCapitalLossesMember" abstract="true" name="ForeignCapitalLossesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_OtherChargesFromBusinessAndAssetActionsMember" abstract="true" name="OtherChargesFromBusinessAndAssetActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_CapitalLossCarryforwards" abstract="false" name="CapitalLossCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_TaxAuthorityUnitedStatesStateLevelTaxAgenciesMember" abstract="true" name="TaxAuthorityUnitedStatesStateLevelTaxAgenciesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TaxAuthoritySaudiArabiaMember" abstract="true" name="TaxAuthoritySaudiArabiaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TaxAuthoritySouthKoreaMember" abstract="true" name="TaxAuthoritySouthKoreaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TaxAuthorityTaiwanMember" abstract="true" name="TaxAuthorityTaiwanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TaxAuthorityChileMember" abstract="true" name="TaxAuthorityChileMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_MantleRidgeLPAndAffiliatesTransactionMember" abstract="true" name="MantleRidgeLPAndAffiliatesTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ExecutiveSeparationCostsMember" abstract="true" name="ExecutiveSeparationCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ShareholderActivismCostsNetOfTax" abstract="false" name="ShareholderActivismCostsNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_OtherForeignOperationsMember" abstract="true" name="OtherForeignOperationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
